You can convert IGES/IGS CAD files to Collada DAE format with AutoCAD or similar CAD program. There also exist dedicated CAD converters that help users to transfer CAD from one vendor format to another. For more possible options check out the igs to dae conversion entry.
Open IGES file Open DAE fileA Mac version of the popular 3D visualisation software
A 3D product data optimalization software
A converter for 3D formats
An online CAD conversion service
An open source multiplatform 3D CAD/MCAD/CAx/CAE/PLM modeler
A commercial online CAD converter
A 3D CAD translation software